Filter assembly

ABSTRACT

A filter assembly including a cylindrical wire mesh having a cylindrical apertured plastic cage therearound. The mesh is embedded in the plastic for support.

U United States Patent 11 1 1111 3,779,390

Oberthur 1 Dec. 18, 1973 l FILTER ASSEMBLY 3.332.557 7/!967 Pall 210/4972,598,818 6/l952 Muirhead 210/450 [75] Inventor: Hemnch obenhu"2,658,625 11/1953 Rafferty 210/497 Offenbach-Rumpenheim, Germany [73]Assignee: ltt Industries, Inc., New York, N.Y. Primary Examiner samih NZahama [22] Filed: May 18, 1972 Assistant ExaminerPeter A. Hruskoci [2]]Appl No: 254,450 Attorney-C. Cornell Remsen, Jr. et al.

[52] [1.5. Cl. 210/495, 210/497 AB TRA T [51] Int. Cl BOld 29/30 [57] SC [58] Fleld of Search 55/498; 2lO/448, A filter assembly including acylindrical wire mesh 210/4501 497 having a cylindrical aperturedplastic cage therearound. The mesh is embedded in the plastic for sup-[56] References CIted port UNlTED STATES PATENTS Freedlander 2 lO/495 2Claims, 4 Drawing Figures PATENTEDUECIB I975 3,779,39U

SHEET 10? 2 SHEET 2 0F 2 PATENTEI] DEC 1 8 I975 FILTER ASSEMBLYBACKGROUND OF THE INVENTION This invention relates to the fluid handlingart, and more particularly, to wire screen filters.

In the past, it has been difficult and expensive to make and installcylindrical wire screens for use as filters in fluid flow systems.

SUMMARY OF THE INVENTION In accordance with the device of the presentinvention, the above-described and other disadvantages of the prior artare overcome by providing a cylindrical screen embedded in an aperturedplastic cage.

According to another feature of the invention, the cage is also moldedonto a mounting flange.

A fine wire mesh formed to a hose is cast into a plastic cylinder closedby a bottom, said plastic cylinder having several apertures on itsperipheral surface. An annular-shaped'metal shoulder is provided at theopen end of the plastic cylinder, said metal shoulder in its inclinationfollowing the inclination at the transition between the pressure mediumbore and the thread connection bore.

The apertures can be rectangular and are distributed evenly on theperiphery of the filter insert piece.

The diameter of the plastic cylinder is smaller than that of thepressure medium bore in which it is to be inserted. A collar is cast onthe open end of the filtering surface, said collar fitting glidinglyinto the pressure medium bore; the metal shoulder is cast via its innerperiphery into the external end of the filter insert piece.

The filtr insert piece can be clamped sealingly via the inclinedannular-shaped metal shoulder between the inclination at the transitionbetween pressure medium bore and at the end of a pipe line coupling or ahose coupling.

The above-described and other advantages of the present invention willbe better understood from the following detailed description whenconsidered in connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings which are to beregarded as merely illustrative:

FIG. 1 is a longitudinal sectional view of the inventive filter insertpiece with regard to a pipe connection of the pressure medium line withthe housing of a hydraulic device;

FIG. 2 is a longitudinal sectional view of the same filter insert piecewith regard to a hose connection of the pressure medium line;

FIG. 3 is a transverse sectional view of the filter insert piece takenon the line 3-3 shown in FIG. 4; and

FIG. 4 is a longitudinal sectional view of the filter insert piece takenon the line 44 shown in FIG. 3.

DESCRIPTION OF THE PREFERRED EMBODIMENT Both FIGS. 1 and 2 show thehousing 1 of a hydraulic device. In this view of a cylindrical bore 2serving as pressure medium line is provided, said bore 2 opening via afrusto-conical surface 3 into an internally threaded counter bore 4 forthe connection of the pressure medium connection from the outside.

The filter insert'piece or assembly includes a fine wire mesh which isrolled into a cylindrical mesh 7.

This cylindrical mesh 7 is partially covered with plastic by preformedand apertured, axially split cylinder halves or by injection molding theplastic to the shape of an articulated cage or apertured cylinder 5shown in FIGS. l4. By heating the preforrns while under pressure or byinjection molding, the plastic fills the interstices over certain meshareas and the mesh becomes fixed relative to the plastic because it isat least partially embedded therin.

The surface of said cylinder 5 has four apertures 6.

The outside diameter of cylinder 5 is smaller than the inside diameterof the pressure medium bore 2. The plastic cylinder 5 closes one end ofwire mesh cylinder 7. Cylinder 5 has an integral collar which fitsslidingly in the pressure medium bore 2. During the molding processdescribed hereinbefore, the collar 8 is molded to the inside rim of anannular metal shoulder 9, the conical angle of said metal shoulder 9being the same as the conical angle of the surface 5 at the transition!of the pressure medium bore 2 into the counterbore 4.

FIG. 1 shows the inserted filter insert piece described above being usedwith a pipe connection. A pressure medium pipe 10 is connected in theknown manner via a pipe line coupling 1 1 which is screwed into thecounterbore 4. The free end 12 of the pressure medium pipe 10 projectsto a certain extent from the pipe line coupling 11 and is flanged.

If the filter insert piece is inserted in the pressure medium bore untilthe metal shoulder 9 rests on the surface 3, and if subsequently thepipe line coupling 11 is screwed into the counterbore 4, the flanged end12 of the pressure medium pipe 10 will come to rest sealingly againstthe surface of the metal shoulder 9 and press it sealingly against thesurface 3. The filter insert piece is thus kept in place.

FIG. 2 shows the same filter insert piece being used with a hoseconnection. The inclined end 13 of the hose coupling 14, known per se,also comes to rest against the metal shoulder 9 of the filter insertpiece, when screwed in, and clamps the filter insert piece.

The invention allows the arrangement of a filter in a line or a lineconnection respectively of conventional type without structural changesand without special auxiliary and fixing means.

The direction of flow in FIGS. 1, 2 and 4 may be ei ther to the right orto the left, and in FIG. 3, the flow may be either radially inward orradially outward, respectively.

The changing of the filter is effected in the most simple and rapidmanner as possible.

The medium coming from the connected pipe or hose line is bound to passthrough the fine wire mesh 7 and the apertures 6 of the supportingplastic cylinder 5 into the remaining space between the plastic cylinder5 and the wall of the pressure medium bore 2.

Shoulder 9 has three angularly spaced and equally spaced projections 9'to hold collar 8 in a fixed position relative thereto. I

What is claimed is:

l. A filter assembly comprising: a cylindrical wire mesh; a cylindricalplastic cage enclosing said mesh and molded into the interstices thereofto prevent movement thereof, said cage generally enclosing all of saidmesh except one end thereof, said cage having at least one holetherethrough in registration with a portion of said interstices topermit fluid flow from the interior of said mesh to the exterior thereofand vice versa through means is an apertured frusto-conical disc havingsaid plastic at said one mesh end moided around the inside edge of saiddisc in a fluid tight manner.

1. A filter assembly comprising: a cylindrical wire mesh; a cylindricalplastic cage enclosing said mesh and molded into the interstices thereofto prevent movement thereof, said cage generally enclosing all of saidmesh except one end thereof, said cage having at least one holetherethrough in registration with a portion of said interstices topermit fluid flow from the interior of said mesh to the exterior thereofand vice versa through said portion; and means fixed relative to saidcage for mounting said cage in a position such that fluid can enter orexit the interior of said mesh through said one end thereof.
 2. Theinvention as defined in claim 1, wherein said means is an aperturedfrusto-conical disc having said plastic at said one mesh end moldedaround the inside edge of said disc in a fluid tight manner.